Drilling apparatus



Sept. 30, 1930., H. BRNl-:TT l 1,777,156

DRILLING APPARATUS Filed Aug. 28, 192e 2 sheets-sheet 1 @Hoz nu? Sept.30, 1930. H. BARNETT DRILLING APPARATUS Filed Aug. 28, 1926 2Sheets-Sheet 2 Patented Sept.. E56), i193@ 'usaran @FEELING APPARlT'US.Application filed August 2S, i925.

My invention relates to improvements in drilling.v apparatus and moreparticularly to shock-absorbing means for rotary drill pipes or rods.

rlhe primary object. of the invention is to provide an attachment fordrill pipes or rods which will `absorb the shocks and torsional strainsto which the drill pipe is subjected, when in operation the movement ofthe drill lo bit is momentarily or suddenly arrested, thereby,preserving and lengthening the life of the drill pipe and bit. l

A further obj ect of the invention is to provide a device of theabove-mentioned charla acter which will equalize the pressure on thedrill bit, increasing the speed of drilling the hole.

A still further object of the invention is to provide a device of theabove-mentioned 2@ character having means for protecting the mechanismfrom sand and gravel, so its operation will not be impaired.

Another object of the invention is to provide a device of theabove-mentioned character which is simple and durable in construction,reliable and eflicient in operation and inexpensive to manufacture.

Other objects and advantages of the invention will be apparent duringthe course of the following description.

In the accompanying drawings, forming a part of this specification andin which like numerals are employed to designate like parts throughoutthe same,

Fig. 1, is a front elevation of my invention,

Fig. 2, is a longitudinal sectional View of the same,

Fig. 3, is a cross sectional view taken on lines 3-3 of Fig. 2,

Fig. 4, is a cross sectional view taken on lines 4.-4 of Fig. 2,

Fig. 5, is a longitudinal sectional view of a modified form of myinvention Fig. 6, is a cross sectional view taken on 45 lines 6-6 ofFig. 5, and,

Fig. 7 is a cross sectional view taken on lines 7 7 of Fig. 5.

Referring to the drawings, the numerals.

5 and 6 denote upper and lower sections of my attachment, the lower endof the upper Serial No. 132,195.

section being reduced, as at 7, and adapted to lit in the bore 8 of thelower section, as shown in Fig. 2. Connection is established between theupper and lower sections by the right handed male screw-thread 9 formedon the outside of the reduced end 7 of the upper section which engagesthe female screwthread 10, formed within the bore 8 of the lowersection. The, upper section is provided with a central bore 11, enlargedat its upper en end, forming a shoulder` 12, on which the spider 13rests, being iixedly secured thereto, by screws 14. The spider has araised bearing plate 15, which extends into the bore 11, to which theupper end of the rod 16 is fas- 6E tened by the nut lock 17 rl`he lowerend of the rod 16 is equipped with an elongated split hollow shell 18,adapted to receive the head 19 at the end of the rod 20, which has vitslower end secured by a nut lock 20 to the spider 21, which is secured tothe underside of the ledge 22 formed wit-hin the lower end of the bore 8of the lower section, in the same inanner as the spider 13. Thisprovides a swivel connection which will expand and contract with thesections and prevents the sections from separating.

A spiral coil spring 23 surrounds the reduced end 7 of the upper sectionhaving its lower end bearing against the thrust bearing 24 seated on theupper end of the lower section and its upper end bearing against thethrust bearing 25, positioned against the shoulder 26. Surrounding theoutside upper end of the lower section, at spaced intervals, are aseries 'of drain grooves 27 and intermediate the grooves the upper endis provided with a series of raised lips 28 which retain the spring andthrust bearing in proper position, so as not to interfer with thecontrac- "0 tion of the sections.

A cover or sleeve 28 composed of sections 29 and 30 encloses the spring23 and each section is secured at its upper end to the outside of theupper section 5, adjacent the shoulder f 26, by screws 31 and extenddown over the upper end of the lower section 6. The confronting edgesot' the sleeve sections are disposed in overlapping relation to permiteX- pansion and contraction. 'lhe lower edges of the sleeve sections arerolled, as at 32, to form Y a pocket for the reception of the annularspring 33 which normally holds the sleeve in close engagement with theoutside of the lower section 6, to keep out sand and gravel.

The lower outside end of the reduced end 7 of the upper section isprovided with a beveled groove 34 to receive a packing ring 35 whichestablishes a tight connection between the reduced end 7 and the bore ofthe lower section. A second coil spring 36 is interposed between thelower end of the reduced end 7 and the top edge of the ledge 2:2 andeach end of the spring bears against an annular roller thrust bearing37. The top of the ledge 22 is surrounded by a series of spaced draingrooves 38 similar to the drain grooves 27. A series of oil vents 38extend through the walls of the lower section 6, for lubricating thescrew-threads 9.

The bores of the sections 5 and 6 at their free ends are provided withscrew-threads 39 for connection with the drill pipe, not shown. Theoutside of each section adjacent their ends are provided with wrenchopenings 40 and their extreme ends are threaded, as at 41, for theattachment of special accessories, and when not in use the threads arecovered by the collar 4Q, screwed thereon.

In Figs. 5. 6 and 7, a modified form of my invention is shown and sincethe construction of this form is substantially the same as the preferredform, the same reference characters are employed to designate like partsthroughout the same. In this form the screw-threaded connection betweenthe upper and lower sections 5 and 6 is re laced by a tongue and grooveconnection. he reduced endg? of the upper section has longitudinal ribs43 formed on opposite sides, which lit in longitudinal rooves 44 formedin opposite sides of the ore 8 of the lower section. The lower end ofthe reduced end 7 and the upper end of the lower section are recessedaround their outer and inner edges, respectively, to form packinggrooves 45, adapted to receive suit able packing, retained in thegrooves by packing washers 46 secured in place by screws 47. In thisform of my invention the thrust bearings of the springs are eliminated.

In use, one or more of my devices are interposed in the drill pipe andmay be connected directly with the sections of the pipe or by means ofreducers and bushings commonly known in the art. In operation the drillpipe rotates in a clock-wise direction and when the drill bit strikes anobstruction or hard substance causing its movement to be suddenly ormomentarily arrested, the sections of my device will contract and theshocks and torsional strains imparted to the drill pipe will be absorbedby the coil springs, the tension of which is suiiicient to resist theshocks and strains to which the drill pipe is ordinarily subiected. Theexpansble sleeve protecting the parts from interference by sand andgravel and the swivel connection between the sections holding thesections from separating, and the roller bearings permit the sections tofreely contract and expand. When the pressure on the drill pipe isreleased the sections of the device will be automatically returned totheir normal positions.

It is to be understood that the form of my invention herewith shown anddescribed is to be taken as a. preferred example of the same and thatcertain changes in the shape, size and arrangement of the parts may bemade without departing from the spirit of the invention or the scope ofthe subjoined claims.

Having thus described my invention, I claim:

l. A device of the character described comprising a pair of tubularsections threadedly connected together, inner and outer springs forresisting the contraction of said sections and an expansible sleeveenclosing said outer spring.

2. A device of the character described comprising a pair of telescopingtubular sections threadedly connected together, a contractible swivelconnection joining said sections together, inner and outer springs forresisting the contraction of said sections, and an expansible sleeve forenclosing said outer spring.

3. A device of the character described comprising upper and lowersections, said upper section having a reduced end adapted to t in saidlower sect-ion, threads connecting said sections together, a springsurrounding said reduced end having its lower end seated on the upperend of said lower section, an expansible sleeve connected to the uppersection enclosing said spring and fitting over the upper end of saidlower section, a second spring mounted within said lower section havinglits upper end bearing a ainst the end of the upper section and a swiveconnection joining the upper and lower sections.

4. A device of the character described comprising a body composed oftelescoping tubular sections, springs for expanding and resistingcontraction of said sections and a contractible swivel connecting saidsections and limiting the expansion thereof.

5. A device of the character described comprising a body composed oftelescoping tubular sections, springs for expanding and resisting thecontraction of said sections, 'and a contractible swivel within saidtubular sections connecting said sections and limiting the expansionthereof.

6. A device of the character described comprising a body composed oftelescoping tubular sections, inner and outer springs for resisting thecontraction of said sections and an expansible sleeve enclosing saidouter sp1-1n 7. device of the character described comprising a bodycomposed of upper and lower sections telescopically fitted together,springs for resisting the contraction of said sections, and draingrooves around the upper edge of said lower section.

8. A device of the character described com'- prising upper and lowertubular sections, said upper section having a reduced end telescopicallytted in the bore of said lower section, springs for resisting thecontraction of said sections and an expansible sleeve connected to saidupper section and extending down below the upper edge of the lower secntion.

In testimony whereof I aix my signature.

HUBERT BARNETT.

